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Tanks, Caps & Fuel Pumps

Motorcycle Fuel Tanks & Fuel Pumps

The fuel tank and fuel pump are the foundation of your motorcycle's fuel delivery system. The tank stores the fuel that everything else depends on, and the pump delivers that fuel at consistent pressure to the carburetor or fuel injectors regardless of fuel level, temperature, or engine load. When either component fails or falls short of what the riding situation demands, the consequences range from inconvenient to dangerous. Running out of fuel miles from the trailhead because the stock tank capacity does not match the range your riding requires is frustrating. A failing fuel pump that delivers inconsistent pressure causes surging, power loss, and hard starting that mimics carburetor and ignition problems and leads riders down expensive diagnostic rabbit holes before the actual cause is identified. Getting the right tank and maintaining a healthy fuel pump are unglamorous but essential parts of keeping any motorcycle reliable in the field.

Fuel tank selection is one of the most practical decisions a serious off-road or adventure rider makes. The stock tank on most dirt bikes is sized for average recreational riding distances, not for long enduro stages, multi-day adventure tours, or remote backcountry riding where fuel availability is genuinely uncertain. Larger capacity aftermarket tanks and auxiliary fuel solutions extend range in ways that open up riding opportunities that the stock tank simply does not allow. For street and adventure riders who cover long highway distances between fuel stops, a larger tank means fewer interruptions and more flexibility in route planning. Mad Lads Moto stocks fuel tanks, auxiliary fuel solutions, fuel pumps, and fuel delivery components for dirt bikes, motocross machines, enduro bikes, street bikes, and adventure tourers. Here is what we carry:

  • Replacement Fuel Tanks - OEM-spec replacement fuel tanks for machines where the stock tank has been cracked, dented, or punctured in a crash, or where fuel contamination from a degraded tank lining requires complete tank replacement.
  • Oversized & Enduro Tanks - High-capacity aftermarket fuel tanks that replace the stock tank with a larger capacity unit for extended range on enduro races, multi-day adventure tours, and remote off-road riding where the stock tank capacity is a genuine limitation.
  • Auxiliary Fuel Systems - Auxiliary fuel tanks, fuel cells, and supplemental fuel solutions that add capacity alongside the stock tank for riders who want extended range without replacing the original tank entirely.
  • Fuel Pumps - OEM-spec and high-performance replacement fuel pumps for fuel-injected motorcycles where the stock pump has failed or is showing signs of inconsistent delivery that affect performance and starting reliability.
  • Fuel Pump Kits & Components - Fuel pump rebuild kits, fuel pump screens, and fuel pump components for machines where targeted component replacement is more practical than a complete pump replacement.
  • Fuel Valves & Petcocks - Replacement fuel valves, petcocks, and vacuum-operated fuel valve assemblies for carbureted motorcycles where the stock valve has begun to seep, failed to shut off completely, or requires replacement as part of a fuel system service.
  • Fuel Caps & Vents - Replacement fuel caps, locking fuel caps, fuel tank vent tubes, and vent hardware for tanks where the original cap has been lost, damaged, or where the vent system has become blocked and is causing fuel delivery problems from tank vacuum.
  • Fuel Lines & Fittings - Replacement fuel lines, fuel line fittings, and fuel hose clamps for machines where the stock fuel lines have cracked, hardened, or deteriorated from age and ethanol exposure in ways that create fuel leaks and fire risk.

A blocked or malfunctioning fuel tank vent is one of the most commonly misdiagnosed fuel delivery problems on carbureted motorcycles, particularly older machines where the vent tube has cracked, kinked, or become blocked by debris. The fuel tank needs to vent to atmosphere as fuel is consumed to prevent a vacuum from developing in the tank that progressively restricts fuel flow to the carburetor. The classic symptom of a blocked tank vent is an engine that starts and runs normally for ten to twenty minutes and then begins to lose power, run lean, and eventually stall as the vacuum in the tank builds to the point where fuel flow is restricted. Opening the fuel cap immediately restores normal operation as the vacuum is released. If your machine exhibits this specific symptom pattern, check the tank vent tube before touching the carburetor. We stock fuel tank and fuel pump components for Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, Beta, GasGas, and more. Use our year, make, and model fitment tool to confirm fitment before you order.

How much extra range does an oversized fuel tank add to my dirt bike or enduro bike?

The range increase from an oversized tank depends on your stock tank capacity, the capacity of the replacement tank, and your machine's fuel consumption rate. Most full-size four-stroke dirt bikes come with stock tanks in the two to two and a half gallon range and get between twenty and thirty miles per gallon depending on riding conditions and engine size. A three gallon tank adds roughly twenty to thirty miles of range over a two gallon stock tank. Enduro-specific tanks are commonly available in three to four gallon capacities, and some extreme range tanks push beyond that for machines used in long-distance enduro events where fuel availability is limited. For adventure touring machines with already generous stock tanks, auxiliary fuel options that add one to two gallons of supplemental capacity are often a more practical solution than a complete tank replacement for riders who need just a little more range between stops on remote routes.

How do I know if my motorcycle fuel pump is failing?

A failing fuel pump on a fuel-injected motorcycle produces symptoms that can be mistaken for ignition, injector, or ECU problems before the pump is identified as the cause. The most common symptoms include hard starting particularly when the engine is warm, surging or hesitation at steady throttle speeds that feels like the engine is hunting for the correct fueling, a loss of power at higher RPM where the engine's fuel demand exceeds what a weakening pump can deliver, and stalling under load that is not reproducible at idle. A fuel pressure test using a gauge connected to the fuel rail is the most reliable way to confirm a pump problem, as a pump that is delivering below the manufacturer's specified pressure at idle and under load is clearly failing regardless of whether it can maintain pressure at rest. Fuel pump failure often happens gradually rather than all at once, which is why the symptoms can be intermittent and difficult to reproduce consistently before the pump deteriorates to the point of complete failure.

Can ethanol in pump gasoline damage my motorcycle fuel tank or fuel system?

Yes, ethanol in pump gasoline can cause damage to fuel system components over time, particularly on older machines designed before ethanol-blended fuels were common and on machines that sit for extended periods between riding sessions. Ethanol is hygroscopic, meaning it absorbs moisture from the atmosphere, and the water-ethanol mixture that accumulates in a fuel system that sits unused attacks rubber fuel lines, dissolves certain carburetor diaphragm materials, corrodes aluminum carburetor components and fuel tank interiors, and leaves varnish deposits in jets and passages when the fuel evaporates. Machines that are ridden regularly and whose fuel is consumed quickly before significant moisture absorption occurs are less affected than machines that sit for months with ethanol-blended fuel in the system. Using ethanol-free fuel where available, adding a quality fuel stabilizer for any storage period longer than thirty days, and draining the float bowl on carbureted machines before storage are the most effective ways to prevent ethanol-related fuel system damage.
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